Harris Legacy 99-1300-0, Operation & Technical Manual

Page: 57 / 98

2 Installation
Revision B • 1/03
H A R R I S C O R P O R A T I O N
2-45
FUNCTIONAL DESCRIPTION OF CONNECTION
Normally Open (N/O) contact output. A contact closure to Logic Ground (pin 16) occurs while the External site
receives Talk to External in order to dim the monitor speakers using an external device.
Normally Open (N/O) contact output. A contact closure to Logic Ground (pin 16) occurs when an External
microphone is turned on in order to mute the monitor speakers using an external device.
When pulled low, routes the Talk From External audio input to the Control Room talkback bus. Typically not used
in this application since Talk to C/R is done through the External’s Mic module.
Normally Open (N/O) contact output. A contact closure to Logic Ground (pin 16) occurs while the External site is
receiving Talk To External talkback audio.
To enable the control input Talk to C/R, tie this pin to + logic voltage (+5 to +40). Typically not used in this
application.
Module logic voltage output sources that can deliver up to 300 mA of current to isolated control panels. All pins
are simply paralleled for convenience.
Module logic ground. Should be connected to isolated control panels only.
Shields the talkback audio going to the External location.
Balanced audio (differential pair) connections for the Talkback audio going to an External location’s powered
monitor speaker.
Shields the talkback audio coming from an External location. Typically not used in this application.
Balanced audio (differential pair) connections for the Talkback audio coming from an External location. Typically
not used in this application.
PIN NAME/NUMBER
LOGIC CONNECTIONS:
EXTERNAL DIM
COMMAND
(pin 5) *
EXTERNAL MUTE
COMMAND / RELAY
(pin 4) *
TALK TO CONTROL ROOM (-)
(pin 14)
TALK TO EXTERNAL TALLY
(pin 6)
ACTIVATE LOGIC INPUTS (+)
(pin 15)
LOGIC 5VDC
(pins 7 & 8)
LOGIC GROUND
(pin 16)
AUDIO CONNECTIONS:
TALKBACK AUDIO TO
EXTERNAL, SHIELD
(pin 10)
TALKBACK AUDIO TO
EXTERNAL, (-) & (+)
(pins 3 & 11)
TALKBACK AUDIO FROM
EXTERNAL, SHIELD
(pin 2)
TALKBACK AUDIO FROM
EXTERNAL, (-) & (+)
(pins 1 & 9)
* This pin functions differently when DIP switch 7 is set to Off (see page 2-42).
Studio Module, External — Signal Definitions (with DIP Switch 7 set to On)